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                [Poi1997]Rek 蚂蚁的递归访问                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">&nbsp; </span></p>
<div v:shape="_x0000_s1026"><span style="font-size: medium">给定一个边长为2<span style="position: relative; top: -0.45em">n</span>棋盘，其中有M个格子是坏掉的。一个蚂蚁要从棋盘的左上角开始，遍历整个棋盘。每个点必须且仅允许走一遍。蚂蚁走的时候把棋盘分成了四个2<span style="position: relative; top: -0.45em">n-1</span>&nbsp;个小棋盘，蚂蚁总是走完其中的一个后再继续走下一个，也就是说，在进入一个小棋盘后，它必须把其中的所有点遍历以后才能走其他的点。</span></div>
<div v:shape="_x0000_s1026"><span style="font-size: medium"><img alt="" src="../file/2524_0.jpg" /></span></div>
<p></p>
<div class="O" v:shape="_x0000_s1026" style="mso-line-spacing: '100 50 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><span style="font-size: medium"><span style="font-family: SimSun; mso-ascii-font-family: SimSun; mso-hansi-font-family: 'Times New Roman'; mso-fareast-font-family: SimSun">对于上下左右四个边界，寻找边界上的一个格子，使得该格可以作为蚂蚁访问路线的终点</span></span></div>
<p></p>
<div class="O" v:shape="_x0000_s1026">
<div style="mso-line-spacing: '100 50 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><span style="font-size: medium"><span style="font-family: SimSun; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-fareast-font-family: SimSun"><b>其中</b></span><span style="font-family: Verdana; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana; mso-fareast-font-family: SimSun"><b><span style="mso-spacerun: yes">&nbsp; </span>N &lt;= 30 , M &lt;= 50 </b></span></span></div>
<div style="mso-line-spacing: '100 50 0'; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></div>
</div></p><hr/><h3>输入格式</h3><p></p><hr/><h3>输出格式</h3><p></p><hr/><h3>样例输入</h3><pre>3
17
2 0
1 0
3 0
6 0
7 0
6 1
7 1
6 2
7 2
6 3
7 3
0 2
0 3
0 6
0 7
1 6
1 7
</pre><hr/><h3>样例输出</h3><pre>NIE
NIE
NIE
NIE
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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